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Yes because 6+4+2 is divisible by three.
The simple way to decide if any number is entirely divisible by three is to first discard any digit in the number that is divisible by three (3, 6, 9) then add any of the digits remaining together and if at any point you get something that is divisible by three you can disregard those digits. If at the end you have a remainder, the number is not evenly divisible by three. If there is no remainder the entire number is divisible by three.
In your example 642, I threw away the 6 leaving 4 and 2 , added those = 6 which is divisible by three (actually I remembered that 42 was divisible by 6 so I knew right after I had taken away the first 6 that your number was divisible by 3.
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∙ 14y ago
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Is 642 by divisible by 9?
No. 642 is not evenly divisible by nine.
How can you tell that 642 is divisible by 3?
You can add up the digits, 6+4+2=12 and if that number is divisible by three, so it the original number. So 12 is certainly divisible by 3 so that means 642 is also.
What is 135 798 642 not divisible by?
5
Is 642 divisible by 6?
Yes and it is 107
Is 642 divisible by 2?
Yes, evenly
Is 642 by divisible by 9?
No. 642 is not evenly divisible by nine.
Is 642 prime or composite?
642 is composite. It is divisible by 2, 3, 107, 214, and 321.
How can you tell that 642 is divisible by 3?
You can add up the digits, 6+4+2=12 and if that number is divisible by three, so it the original number. So 12 is certainly divisible by 3 so that means 642 is also.
What is 642 divisible by?
1, 2, 3, 6, 107, 214, 321, 642
Is 642 a prime number?
Just by looking at it, without trying any factors to see if they work, you can see-- 642 is even, i.e. divisible by 2, since it ends in '2'-- 642 is divisible by 3, since its digits add up to (6+4+2) = 12 which is divisible by 3.Just looking at 642, you already know of at least 2 factors that it has besides '1' and itself,so it can't be a prime number.
What is 135 798 642 not divisible by?
5
Is 642 divisible by 2?
Yes, evenly
Is 642 divisible by 6?
Yes and it is 107
What is the divisible of 1248?
here are some 2,3,4,6,8,12,13,16,24,26,32,48,52,321&642
Is 642 divisible by 4 and 6?
Only by 6 evenly with no remainder
What is 642 times 3?
642 x 3 = 1926
Is 642 prime?
No, the first give-away is that it is an even number (divisible by 2).
